Graphic Cards Switching between a GeForce 635M and an Intel HD4000.

Okay, so I have a laptop which has both these GPUs. Games seem to detect only the Intel GPU. I've installed the latest nVidia drivers. I thought I'd disable Intel HD 4000 in the Device Manager, but doing this turned my monitor off. I restarted the system (the font size became really big on doing this) and now when I try to open nVidia's control panel, it tells me that I don't have an nVidia card attached to my display.

How do I run my laptop on the GeForce?

How do I know which GPU a game/application is using when it's running? Some games just detect the IGP (HD4000) and not the dGPU (GeForce).

Posted this on ATOT too, so kindly do not tell me things that I've already been told here: http://forums.anandtech.com/showthread.php?p=35061223
 
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